Welcome to planDisney, Scott!
I hope you're getting excited for your time at The Most Magical Place on Earth! It sounds like you might be visiting Disney World with a high school marching band! I've had the opportunity to see a high school band perform before and it was incredible -- I'm always so impressed with marching band's talents!
So, the parade route for the high school marching bands typically follows the traditional 3/4 mile route that the parades (like
Festival of Fantasy) use. This route starts at the Frontierland Parade Gate -- this is located between Pirates of the Caribbean and
Tiana's Bayou Adventure. They will march down the length of Frontierland until it transitions into Liberty Square. They'll veer right to pass the Hall of Presidents/Ye Olde Christmas Shoppe/
Sleepy Hollow then make their way by Cinderella Castle. They'll then make a turn around the Partners statue (the one of Walt and Mickey) in front of the Castle. They'll finish by marching down Main Street, circling the flagpole and the front of Main Street, and exit through the Town Square Parade Gate.
If you decide to watch on Main Street, I highly recommend getting a customized popcorn at Kernel Kitchen within
Main Street Confectionery! This will make a delicious snack to see you through the parade!
If you have additional questions before your visit, Scott, we hope to hear from you again soon at planDisney!
Allyn